Kevin, I'm not super code smart but I think maybe your picture links from bushcraftnederland.nl are the code to download them to your machine/your access to their location and not the "display" codes.
At least when I mess with the links it takes me to an error page on their site gives a notice about keeping them under 10mb- google translate isn't perfect but the error page looks like something a logged-in member there would get.
It may be also that their site frowns upon offsite picture linking - some do that to limit the bandwidth traffic burden on them to become secondary content hosts.
Hickory n Steel wrote this up last night for Harry.
What you'll want to do is create a postimage account because you have to use an image hosting sight if you don't have a paid membership.
You don't need to download the app or anything, just created you account.
Once you find where it says to upload and says choose photo or video you can either select documents for a picture you've already taken or choose camera to take the picture right then.
Once the upload is complete you can scroll down and select the thumbnail for forums to copy it ( it'll say copied )
The you can post your pictures here in the Bernard Levine's collector and identification forum
To do this you just tap and hold and select paste.
As far as a host, I use Photobucket but it can be annoying. Someone could recommend a better one.
If you have posts on the nederlandbushcraft site you might try navigating to one of your posts, right click, "copy image address", choose the Mountain/Sun icon, paste there (insert picture) - if that site doesn't host your picture directly you might just be able to lift the address of the one that does.
*I tried to make an account there just now but can't get through the antibot verification of the question, "
wat krijg je na het omdraaien van sob:" lol (any help there would be appreciated)